[backport 2.11] wal: fix failing assertion in box_wait_limbo_acked #9468
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Before this patch there was an execution sequence in which the assertion in box_wait_limbo_acked would fail. The assertion is that the lsn of the last entry in limbo is always positive after wal_sync. Fix it.
Closes #9235
NO_DOC=bugfix
(cherry picked from commit 59b817e)